5-3
Yearly:
• If the VP-5 Option was purchased with the furnace replace the oil. Use
only SST #32505 for this purpose. Remove and inspect the in-line
vacuum filter on the suction side of the pump. If the filter is full of debris
on the inlet side, back flush it with a suitable solvent to remove the debris
and bake it out, otherwise replace it.
5.2 Troubleshooting Guide
Troubleshooting information is provided in this section to assist the operator and
service technician in diagnosis of equipment problems. SST International may
be contacted directly by telephone, fax or e-mail for assistance in problem
diagnosis and correction. When contacting SST International regarding your
furnace, please be prepared to provide the serial number. The serial number is
located on the nameplate on the rear electrical enclosure.
Danger! During troubleshooting and repair, dangerous voltages are present
inside the rear electrical compartment and underneath the main machine
enclosure when the Power Disconnect Switch is turned on. Service of this
equipment must only be performed by a trained and qualified maintenance
technician.
Whenever electrical problems are encountered, the supply voltage should first be
checked to see that it meets specifications. In addition, internal power supply
outputs and transformer secondary windings should be checked with a voltmeter
for correct voltage levels. The system plumbing schematic together with the
elementary wiring diagram will be helpful and should always be referred to when
using this section, these documents can be found in the documentation package
in Section 6.
User manuals for the optional vacuum pumps, digital vacuum gage and other
optional features were shipped with the machine. Please refer to these manuals
for more detailed diagnostic information when troubleshooting these items.
The information contained in this section is divided into the following general
categories with possible causes for each symptom or failure. Specific
instructions for parts replacement are to be found in Section 5.3.
• Vacuum
• Gas Pressure
• Cooling Water
• Alarms
• Heat
• Lid Lock Assist Failure
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